fips: use memory ordering rather than locks

fips: use memory ordering rather than locks

The FIPS provider accesses it's current state under lock.
This is overkill, little or no synchronisation is actually required in
practice (because it's essentially a read only setting).  Switch to using
TSAN operations in preference.

Fixes #21179

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21187)